Add support for openHAB colorwheel

[aHcVolle]

OpenHAB does send the colors in a format like:
{"color_array":[250,12,16]} for (almost) red
{"color_array":[10,250,10]} for (almost) green
{"color_array":[17,29,250]} for (almost) blue

Added key color_array to src/main.h
Added parsing of color_array in processJson() to src/light.ino
This was only copied and might be not really nice...
Added array state to JSON object created in createStateJSON() in src/light.ino
This might also be not too elegant...
Changed JSON_OBJECT_SIZE to 13 to make enough space for the replied state message in src/main.h

[stelgenhof]

Thanks for this PR! I'll have a look in the next coming days. I don't have an openHAB installation here, so can only do limited checking :)

Cheers! Sacha

[aHcVolle]

Sure, take your time 😉
It took me months to finally create the PR so there is no need to hurry 😁
I added the json output of openhab's mqtt output so i think you can take that as a base.
maybe there is another way to do this with openHAB but I couldn't find one.

[stelgenhof]

Already had a look and think it looks fine to me. Only thing I would add is a compiler directive to allow people to either include or exclude this piece of code. This will keep the firmware size small for those who don't use openHAB.

[aHcVolle]

Sure, this is a good idea.

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